Allowing circular references

Is there a way to generate the report allowing for circular dependencies on the parameters?

```
OpenApiDiffErrorImpl [VError]: ReferenceError: Circular $ref pointer found at /builds/#/components/schemas/Content/properties/children/items
at /usr/local/lib/node_modules/openapi-diff/dist/openapi-diff/spec-differ/diff-finder/json-schema-diff.js:27:15
at Generator.throw ()
at rejected (/usr/local/lib/node_modules/openapi-diff/dist/openapi-diff/spec-differ/diff-finder/json-schema-diff.js:6:65) {
jse_shortmsg: 'ReferenceError: Circular $ref pointer found at /builds/#/components/schemas/Content/properties/children/items',
jse_info: {},
code: 'OPENAPI_DIFF_DIFF_ERROR'
}
```

Thank you!

Start at openapi-diff/dist/openapi-diff/spec-differ/diff-finder/json-schema-diff.js, where the circular $ref error is reported, and trace how the Content schema is compared. Determine the intended behavior for /components/schemas/Content/properties/children/items and define completion as generating a report without failing on that circular reference, with coverage for the example specification.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.